If you cut the 5v trace you must solder the 2 resistors and the wire. Without the ftdi Chip do not reset when the usb cable is pluged in.by philipphunger - Sanguino(lolu)
I made a cut at the 5V USB Trace, and added a 4k7 and a 10k Resistor as in the Datasheet of the FT232RL (6.2 Self- Powered) and soldered a wire to pin 19 The datasheet can be found at: Works great but the printer has to be powered by 12V all the Time.by philipphunger - Sanguino(lolu)